I recently upgraded from 11.10 to 12.04 and other than TwinView problems it seemed to be working. While trying to fix the TwinView issues, I rebooted the computer and the keyboard and mouse no longer worked.

I can hit F12 during boot to pick boot device but once the login screen hits neither work. When I ssh into the machine, lsusb shows that both the keyboard and mouse are seen.

1 Answer
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If that's the case, then it's fixed by kernel version 3.7.4. I haven't yet tried it - I'm currently huntingfor a solution myself, but this looks promising once I figure out how to install the later kernel.

I've also had problems with a USB keyboard, but less so.

I find that while the USB mouse is usually not working when I come out of hibernation, it often is working if I try it later in the day (it's usually left plugged in).